those plants in a forest which only reach a relatively low height (such as shrubs and bushes)
{i} underbrush, small trees or shrubs beneath larger trees; short inner layer of hair under the longer fur or wool of certain animals; condition of being undergrown
That which grows under trees; specifically, shrubs or small trees growing among large trees
Undergrowth consists of bushes and plants growing together under the trees in a forest. plunging through the undergrowth. bushes, small trees, and other plants growing around and under bigger trees
the brush (small trees and bushes and ferns etc ) growing beneath taller trees in a wood or forest